Which one is most reactive towards SN1 reaction?
C6H5CH(C6H5)Br
C6H5CH(CH3)Br
C6H5C(CH3)(C6H5)Br
C6H5C(CH3)(C6H5)Br
C.
C6H5C(CH3)(C6H5)Br
SN1 reaction involves the formation of carbocation intermediate. More the stability of carbocation more is the reactivity of alkyl/aryl halides towards SN1 reaction.
The intermediate carbocations formed by given halides as:
Thus, C6H5C(CH3)(C6H5)Br is most reactive towards SN1 reaction.
Which of the following reactions is an example of nucleophilic substitution reaction?
RX + KOH → ROH + KX
2RX + 2Na → R- R
RX + H2 → RH + HX
RX + H2 → RH + HX
A.
RX + KOH → ROH + KX
Nucleophilic substitution reactions involve substitution (replacement) of a group or atom by a nucleophile.
KOH → K+ + OH-
RX + OH- → R - OH + KX
Nucleophiles are either negative charge or a lone pair of electrons bearing species, OH- etc.
In the following reaction, 
the product 'X' is
C6H5CH2OCH2C6H5
C6H5CH2OH
C6H5CH3
C6H5CH3
C.
C6H5CH3
Consider the following reaction,
the product Z, is
CH2 = CH2
CH3CH2-O-CH2-CH3
CH3-CH2-O-SO3H
CH3-CH2-O-SO3H
D.
CH3-CH2-O-SO3H
i) PBr3 is a halogenating agent, ie, converts -OH group into -Br
ii) Alc. KOH is a dehydrohalogenation agent.
iii) H2SO4 and H2O converts an olefin into alcohol
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